Engine cuts out at higher speeds?

[Mechaniac]

I have a 2008 Mean Streak 1600, about 10,500 miles on it. It has an issue that seems to slowly be getting worse. I'm hoping someone on the forum has seen this and can recommend a way to check for the fix.

The engine runs great but starts to cut out randomly at about 110 and will get worse if I keep the throttle open. Sometimes once it's doing this it will reoccur at speeds as low as 85.

It feels like ignition because it's either full power or none. Fuel would fade in and out slower.

I have access to pass through spark indicators but that won't tell me the cause. I also have scanner with a built in scope, but I don't want to spend hours trying to orchestrate that on a bike at high speeds.

It has a Cobra fuel tuner on it. Swapping ECM's didn't change it. Level in fuel tank has no effect.

I'm planning on cleaning and tightening grounds as that seems to be common issue with the Vulcan electronics.

Any tips?

Vernon

[DragonLady58]

Check your grounds, clean your throttle body with carb cleaner, you could also try to either richen up your tuner on top end. The Vulcans have a built in rev limiter, I've seen a few bikes that choke up on top end, where the cylinders get all carboned up and all....
What happens is the fuel won't burn correctly, and isn't being ignited correctly by the plugs....
Also, pull your injectors and check their spray pattern....If after checking all your fuel system, you could be running outta spark also....lie what you were thinking. Iridiums resist fouling, take less voltage to spark....run a primary and secondary checks with your multi-testor on the coils to make sure they're healthy.
About once a month I bounce it off the rev-limiter a couple of times that way carbon doesn't build up.
On my built up Nomad, which has a 1600 in it, once I hit 115, she's still pulling hard and fast, and thats all I dare to go. I've noticed if I try to pass 100 that if I have cheap gas, it loses power as it leans out. I can get around it if I use lucas octane booster....
My Nomad engine has really high compression, I have to watch for knocking, which is why I carry 5 or 6 bottles of the octane booster at all times....hope this helps.

[Mechaniac]

I R&R'ed the fuel pump Saturday with the famous internet brand. The screen and filter were still in excellent shape. It seemed a little punchier but the top end stalling is still there.
The check valve mentioned in another thread is the fuel return fitting check valve. Mine flowed freely with a little compressed air.

This issue isn't due to the fuel supply.

[Chuck A.]

What mufflers are you running? My 1700 with the Ivans tune runs better with the stock mufflers over the V&H. Way more torque thru the rpm range. Some engines just needs the back pressure.

Also check the intake for leaks. Spray some WD40 around the outer intake connections while at an idle and see if the rpm's change. If it does you have a leak.